Williams has made a name for himself in television, earning several Young Artist Award nominations for his work on various series. He is best recognized by soap opera fans for playing Rowdy on General Hospital from 1989 through 1991. TV audiences may also remember him for playing young Thomas Magnum on Magnum, P.I. and Ricky on Full House. Among the other TV series he has appeared on were T.J. Hooker, starring William Shatner, James Darren, and Richard Herd, and St. Elsewhere, starring Chad Allen, Ed Begley, Jr., Norman Lloyd, Deborah May, France Nuyen, Alfre Woodard, and Jane Wyatt.